Shell Programming and Scripting

if [ ! -s /file_path/file_name* ];
then
echo "\n file is not available in /file_path folder \n
\n Regards" | mailx -s "file not received" @userid.com
else
echo "\n file is available in /file_path folder \n
\n Regards" | mailx -s "file arrived" @userid.com

 
#!/bin/ksh
S_EPOCH=$( date +"%s" )
while :
do
        C_EPOCH=$( date +"%s" )
        DIFF=$(( C_EPOCH - S_EPOCH ))
        if [ $DIFF -gt 14400 ]
        then
                print "Script ran for 4 hours. Exiting."
                exit 1
        fi
 
        if [ -f "/file_path/file_name" ]
        then
                print "File: /file_path/file_name received" | mailx -s "File Received" user@domain.com
                exit 1
        else
                print "File /file_path/file_name missing" | mailx -s "File Missing" user@domain.com
        fi
 
        print "Sleeping for 15 minutes..."
        sleep 900
done

#!/bin/bash
now_time=$(date +%Y-%m-%d\ %H:%m:%S)
echo "***Start at: $now_time***"
i=0
while [ i -lt 16 ]
do
        if [ ! -e /path/to/filename ]
        then
                echo -e "The file is not available in /path/to folder.\n" | mailx -s "file not received." @userid.com
                sleep 900
                i=`expr $i + 1`
        else
                echo -e "The file is available in /path/to folder.\n" | mailx -s "file arrived." @userid.com
                break
        fi
done
future_time=$(date +%Y-%m-%d\ %H:%m:%S)
[ i -eq 16 ] && echo "Not received till the cows come home."
echo "***Finish at: $future_time***"